Patents by Inventor Yui Mizutani

Yui Mizutani has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Diffractive optical element and optical system having the same, and image pickup apparatus
    Patent number: 10162188
    Abstract: An optical element includes a first diffraction grating and a second diffraction grating. When a refractive index of the first diffraction grating at wavelength ? [?m] is n1(?) and the refractive index of the second diffraction grating at the wavelength ? [?m] is n2(?), n1(?) and n2(?) satisfy predetermined conditional expressions.
    Type: Grant
    Filed: July 13, 2017
    Date of Patent: December 25, 2018
    Assignee: Canon Kabushiki Kaisha
    Inventor: Yui Mizutani
  • DIFFRACTIVE OPTICAL ELEMENT AND OPTICAL SYSTEM HAVING THE SAME, AND IMAGE PICKUP APPARATUS
    Publication number: 20180045975
    Abstract: An optical element includes a first diffraction grating and a second diffraction grating. When a refractive index of the first diffraction grating at wavelength ? [?m] is n1(?) and the refractive index of the second diffraction grating at the wavelength ? [?m] is n2(?), n1(?) and n2(?) satisfy predetermined conditional expressions.
    Type: Application
    Filed: July 13, 2017
    Publication date: February 15, 2018
    Inventor: Yui Mizutani